MNH Men's Tungsten Carbide Wedding Band Black 8mm Comfort Fit Brushed Matte Finish Ring Size 7-13 Genuine Tungsten,12 kinds of sizes available. 8mm Comfort Fit The inner surface is polished,you will not touch nickel ingredients,so that the rings are hypoallergenic. The density of tungsten is 8-9M,it is just lower than diamond. (Diamond is 10 - the highest). Its density, similar to that of gold, allows tungsten to be used in jewelry as an alternative to gold or platinum. its density is 10 times of 18K gold, 4 times of titanium,5 times of stainless steel. 30 Days Money Back or Exchange Guarantee.We checked all the items carefully before the delivery,if you have any problem,please feel free to contact us.(Please go to Product Description to see more details.)